Peter Hargreaves and Crispin Odey said they think Theresa May will eventually abandon Brexit altogether after concluding it would be impossible to get a deal through Parliament. Mr Hargreaves said he had “totally given up” on Brexit while Mr Odey said “it ain’t gonna happen.” Together the pair donated more than £4million to various Leave campaign groups but criticised Brexiteers for lacking consolidated leadership and direction in the wake of the 2016 vote.

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Mr Hargreaves was the second biggest donor to pro-Brexit groups in the run up to the referendum.

He donated a huge £3.2 million to help get Britain out of the EU but Brexiteer concerns are growing that it might all have been a waste of money with the Prime Minister’s Withdrawal Agreement looking doomed to fail next week’s test in Parliament.

The Brexiteer, who is reportedly worth £2.39 billion, made his money founding Hargreaves Landsdown, which became one of the UK’s largest financial services businesses.

Mr Hargreaves said he thinks the 2016 vote will be overturned because Remainers think the UK is fed up with Brexit.

The 72-year-old told Reuters: “I have totally given up. I am totally in despair, I don't think Brexit will happen at all.

"They (pro-Europeans) are banking on the fact that people are so fed up with it that they will just say 'sod it we will stay'. I do see that attitude.

“The problem is when something doesn't happen for so long you feel less angry about it."

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Brexiteers fear a surge in support for Theresa May calling a second referendum or delaying Brexit (Image: Getty)

Meanwhile Crispin Odey blamed MPs for blocking Brexit.

He explained the current make-up of the Commons, in which around three-quarters of MPs voted to stay in the EU, makes it impossible to get a deal ratified because no deal can be reached which satisfies a majority of the House.

The 60-year-old, who gave £870,000 to Leave groups, said: “My view is that it ain't going to happen.

“I just can't see how it happens with that configuration of Parliament."

Mr Odey, who made his fortune as a hedge fund manager and founding partner of Odey Asset Management, slammed top Brexiteers such as Jacob Rees-Mogg, Boris Johnson, Nigel Farage and Michael Gove as failing to unite the Leave campaign after the referendum.

He said: “The unfortunate thing is that almost nobody is leading the Brexit charge, so it's leaderless, which is the problem.”

Committed Brexiteer Odey added he would be willing to pour millions more into continuing the Brexit fight if Theresa May called a second referendum, while hesitant Hargreaves would not pledge to make more donations.